openai[patch]: Add API Reference docs to OpenAIEmbeddings (#25290)

Issue: [24856](https://github.com/langchain-ai/langchain/issues/24856)

libs/partners/openai/langchain_openai/embeddings/base.py

@@ -99,21 +99,87 @@ def _process_batched_chunked_embeddings(
 
 
 class OpenAIEmbeddings(BaseModel, Embeddings):
-    """OpenAI embedding models.
+    """OpenAI embedding model integration.
 
-    To use, you should have the
-    environment variable ``OPENAI_API_KEY`` set with your API key or pass it
-    as a named parameter to the constructor.
+     Setup:
+         Install ``langchain_openai`` and set environment variable ``OPENAI_API_KEY``.
 
-    In order to use the library with Microsoft Azure endpoints, use
-    AzureOpenAIEmbeddings.
+         .. code-block:: bash
 
-    Example:
+             pip install -U langchain_openai
+             export OPENAI_API_KEY="your-api-key"
+
+     Key init args — embedding params:
+         model: str
+             Name of OpenAI model to use.
+         dimensions: Optional[int] = None
+             The number of dimensions the resulting output embeddings should have.
+             Only supported in `text-embedding-3` and later models.
+
+    Key init args — client params:
+         api_key: Optional[SecretStr] = None
+             OpenAI API key.
+         organization: Optional[str] = None
+             OpenAI organization ID. If not passed in will be read
+             from env var OPENAI_ORG_ID.
+         max_retries: int = 2
+             Maximum number of retries to make when generating.
+         request_timeout: Optional[Union[float, Tuple[float, float], Any]] = None
+             Timeout for requests to OpenAI completion API
+
+     See full list of supported init args and their descriptions in the params section.
+
+     Instantiate:
          .. code-block:: python
 
              from langchain_openai import OpenAIEmbeddings
 
-            model = OpenAIEmbeddings(model="text-embedding-3-large")
+             embed = OpenAIEmbeddings(
+                 model="text-embedding-3-large"
+                 # With the `text-embedding-3` class
+                 # of models, you can specify the size
+                 # of the embeddings you want returned.
+                 # dimensions=1024
+             )
+
+     Embed single text:
+
+         .. code-block:: python
+
+             input_text = "The meaning of life is 42"
+             vector = embeddings.embed_query("hello")
+             print(vector[:3])
+
+         .. code-block:: python
+
+             [-0.024603435769677162, -0.007543657906353474, 0.0039630369283258915]
+
+     Embed multiple texts:
+
+         .. code-block:: python
+
+             vectors = embeddings.embed_documents(["hello", "goodbye"])
+             # Showing only the first 3 coordinates
+             print(len(vectors))
+             print(vectors[0][:3])
+
+         .. code-block:: python
+
+             2
+             [-0.024603435769677162, -0.007543657906353474, 0.0039630369283258915]
+
+     Async:
+         .. code-block:: python
+
+             await embed.aembed_query(input_text)
+             print(vector[:3])
+
+             # multiple:
+             # await embed.aembed_documents(input_texts)
+
+         .. code-block:: python
+
+             [-0.009100092574954033, 0.005071679595857859, -0.0029193938244134188]
     """
 
     client: Any = Field(default=None, exclude=True)  #: :meta private: